author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:57:14 +0300 | |
branch | RCL_3 |
changeset 23 | 26645d81f48d |
parent 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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/* |
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* Internal interface definitions, etc., for the reg package |
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* |
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* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. |
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* |
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* Development of this software was funded, in part, by Cray Research Inc., |
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* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics |
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* Corporation, none of whom are responsible for the results. The author |
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* thanks all of them. |
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* |
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* Redistribution and use in source and binary forms -- with or without |
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* modification -- are permitted for any purpose, provided that |
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* redistributions in source form retain this entire copyright notice and |
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* indicate the origin and nature of any modifications. |
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* |
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* I'd appreciate being given credit for this package in the documentation |
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* of software which uses it, but that is not a requirement. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
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* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* |
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* Environmental customization. It should not (I hope) be necessary to |
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* alter the file you are now reading -- regcustom.h should handle it all, |
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* given care here and elsewhere. |
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*/ |
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#include "regcustom.h" |
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/* |
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* Things that regcustom.h might override. |
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*/ |
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/* standard header files (NULL is a reasonable indicator for them) */ |
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#ifndef NULL |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <ctype.h> |
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#include <limits.h> |
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#include <string.h> |
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#endif |
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/* assertions */ |
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#ifndef assert |
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# ifndef REG_DEBUG |
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# ifndef NDEBUG |
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# define NDEBUG /* no assertions */ |
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# endif |
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# endif |
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#include <assert.h> |
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#endif |
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/* voids */ |
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#ifndef VOID |
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#define VOID void /* for function return values */ |
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#endif |
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#ifndef DISCARD |
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#define DISCARD VOID /* for throwing values away */ |
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#endif |
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#ifndef PVOID |
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#define PVOID VOID * /* generic pointer */ |
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#endif |
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#ifndef VS |
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#define VS(x) ((PVOID)(x)) /* cast something to generic ptr */ |
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#endif |
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#ifndef NOPARMS |
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#define NOPARMS VOID /* for empty parm lists */ |
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#endif |
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/* const */ |
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#ifndef CONST |
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#define CONST const /* for old compilers, might be empty */ |
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#endif |
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/* function-pointer declarator */ |
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#ifndef FUNCPTR |
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#if __STDC__ >= 1 |
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#define FUNCPTR(name, args) (*name)args |
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#else |
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#define FUNCPTR(name, args) (*name)() |
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#endif |
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#endif |
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/* memory allocation */ |
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#ifndef MALLOC |
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#define MALLOC(n) malloc(n) |
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#endif |
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#ifndef REALLOC |
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#define REALLOC(p, n) realloc(VS(p), n) |
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#endif |
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#ifndef FREE |
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#define FREE(p) free(VS(p)) |
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#endif |
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106 |
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/* want size of a char in bits, and max value in bounded quantifiers */ |
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#ifndef CHAR_BIT |
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#include <limits.h> |
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#endif |
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#ifndef _POSIX2_RE_DUP_MAX |
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#define _POSIX2_RE_DUP_MAX 255 /* normally from <limits.h> */ |
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#endif |
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115 |
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/* |
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* misc |
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*/ |
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120 |
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#define NOTREACHED 0 |
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#define xxx 1 |
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123 |
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#define DUPMAX _POSIX2_RE_DUP_MAX |
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#define INFINITY (DUPMAX+1) |
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#define REMAGIC 0xfed7 /* magic number for main struct */ |
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/* |
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* debugging facilities |
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*/ |
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#ifdef REG_DEBUG |
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/* FDEBUG does finite-state tracing */ |
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#define FDEBUG(arglist) { if (v->eflags®_FTRACE) printf arglist; } |
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/* MDEBUG does higher-level tracing */ |
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#define MDEBUG(arglist) { if (v->eflags®_MTRACE) printf arglist; } |
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#else |
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#define FDEBUG(arglist) {} |
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#define MDEBUG(arglist) {} |
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#endif |
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143 |
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144 |
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145 |
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/* |
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* bitmap manipulation |
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*/ |
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#define UBITS (CHAR_BIT * sizeof(unsigned)) |
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#define BSET(uv, sn) ((uv)[(sn)/UBITS] |= (unsigned)1 << ((sn)%UBITS)) |
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#define ISBSET(uv, sn) ((uv)[(sn)/UBITS] & ((unsigned)1 << ((sn)%UBITS))) |
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/* |
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* We dissect a chr into byts for colormap table indexing. Here we define |
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* a byt, which will be the same as a byte on most machines... The exact |
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* size of a byt is not critical, but about 8 bits is good, and extraction |
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* of 8-bit chunks is sometimes especially fast. |
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*/ |
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#ifndef BYTBITS |
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#define BYTBITS 8 /* bits in a byt */ |
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#endif |
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#define BYTTAB (1<<BYTBITS) /* size of table with one entry per byt value */ |
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#define BYTMASK (BYTTAB-1) /* bit mask for byt */ |
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#define NBYTS ((CHRBITS+BYTBITS-1)/BYTBITS) |
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/* the definition of GETCOLOR(), below, assumes NBYTS <= 4 */ |
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169 |
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/* |
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* As soon as possible, we map chrs into equivalence classes -- "colors" -- |
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* which are of much more manageable number. |
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*/ |
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typedef short color; /* colors of characters */ |
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typedef int pcolor; /* what color promotes to */ |
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#define COLORLESS (-1) /* impossible color */ |
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#define WHITE 0 /* default color, parent of all others */ |
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/* |
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* A colormap is a tree -- more precisely, a DAG -- indexed at each level |
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* by a byt of the chr, to map the chr to a color efficiently. Because |
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* lower sections of the tree can be shared, it can exploit the usual |
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* sparseness of such a mapping table. The tree is always NBYTS levels |
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* deep (in the past it was shallower during construction but was "filled" |
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* to full depth at the end of that); areas that are unaltered as yet point |
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* to "fill blocks" which are entirely WHITE in color. |
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*/ |
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191 |
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/* the tree itself */ |
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struct colors { |
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color ccolor[BYTTAB]; |
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}; |
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struct ptrs { |
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union tree *pptr[BYTTAB]; |
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}; |
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union tree { |
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struct colors colors; |
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struct ptrs ptrs; |
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}; |
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#define tcolor colors.ccolor |
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#define tptr ptrs.pptr |
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205 |
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/* internal per-color structure for the color machinery */ |
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struct colordesc { |
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uchr nchrs; /* number of chars of this color */ |
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color sub; /* open subcolor (if any); free chain ptr */ |
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# define NOSUB COLORLESS |
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struct arc *arcs; /* color chain */ |
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int flags; |
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# define FREECOL 01 /* currently free */ |
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# define PSEUDO 02 /* pseudocolor, no real chars */ |
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# define UNUSEDCOLOR(cd) ((cd)->flags&FREECOL) |
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union tree *block; /* block of solid color, if any */ |
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}; |
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218 |
|
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/* the color map itself */ |
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struct colormap { |
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int magic; |
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# define CMMAGIC 0x876 |
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struct vars *v; /* for compile error reporting */ |
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size_t ncds; /* number of colordescs */ |
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size_t max; /* highest in use */ |
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color free; /* beginning of free chain (if non-0) */ |
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struct colordesc *cd; |
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# define CDEND(cm) (&(cm)->cd[(cm)->max + 1]) |
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# define NINLINECDS ((size_t)10) |
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struct colordesc cdspace[NINLINECDS]; |
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union tree tree[NBYTS]; /* tree top, plus fill blocks */ |
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}; |
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233 |
|
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/* optimization magic to do fast chr->color mapping */ |
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#define B0(c) ((c) & BYTMASK) |
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#define B1(c) (((c)>>BYTBITS) & BYTMASK) |
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#define B2(c) (((c)>>(2*BYTBITS)) & BYTMASK) |
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#define B3(c) (((c)>>(3*BYTBITS)) & BYTMASK) |
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#if NBYTS == 1 |
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#define GETCOLOR(cm, c) ((cm)->tree->tcolor[B0(c)]) |
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#endif |
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/* beware, for NBYTS>1, GETCOLOR() is unsafe -- 2nd arg used repeatedly */ |
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#if NBYTS == 2 |
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#define GETCOLOR(cm, c) ((cm)->tree->tptr[B1(c)]->tcolor[B0(c)]) |
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#endif |
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#if NBYTS == 4 |
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#define GETCOLOR(cm, c) ((cm)->tree->tptr[B3(c)]->tptr[B2(c)]->tptr[B1(c)]->tcolor[B0(c)]) |
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#endif |
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249 |
|
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250 |
|
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251 |
|
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/* |
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* Interface definitions for locale-interface functions in locale.c. |
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* Multi-character collating elements (MCCEs) cause most of the trouble. |
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*/ |
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struct cvec { |
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int nchrs; /* number of chrs */ |
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int chrspace; /* number of chrs possible */ |
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chr *chrs; /* pointer to vector of chrs */ |
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int nranges; /* number of ranges (chr pairs) */ |
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int rangespace; /* number of chrs possible */ |
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chr *ranges; /* pointer to vector of chr pairs */ |
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int nmcces; /* number of MCCEs */ |
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int mccespace; /* number of MCCEs possible */ |
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int nmccechrs; /* number of chrs used for MCCEs */ |
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chr *mcces[1]; /* pointers to 0-terminated MCCEs */ |
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/* and both batches of chrs are on the end */ |
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}; |
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269 |
|
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/* caution: this value cannot be changed easily */ |
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#define MAXMCCE 2 /* length of longest MCCE */ |
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272 |
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273 |
|
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274 |
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/* |
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* definitions for NFA internal representation |
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* |
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* Having a "from" pointer within each arc may seem redundant, but it |
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* saves a lot of hassle. |
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*/ |
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struct state; |
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282 |
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struct arc { |
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int type; |
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# define ARCFREE '\0' |
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color co; |
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struct state *from; /* where it's from (and contained within) */ |
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struct state *to; /* where it's to */ |
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struct arc *outchain; /* *from's outs chain or free chain */ |
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# define freechain outchain |
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struct arc *inchain; /* *to's ins chain */ |
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struct arc *colorchain; /* color's arc chain */ |
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}; |
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294 |
|
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struct arcbatch { /* for bulk allocation of arcs */ |
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struct arcbatch *next; |
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# define ABSIZE 10 |
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struct arc a[ABSIZE]; |
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}; |
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300 |
|
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struct state { |
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int no; |
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# define FREESTATE (-1) |
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char flag; /* marks special states */ |
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int nins; /* number of inarcs */ |
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struct arc *ins; /* chain of inarcs */ |
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int nouts; /* number of outarcs */ |
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struct arc *outs; /* chain of outarcs */ |
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struct arc *free; /* chain of free arcs */ |
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310 |
struct state *tmp; /* temporary for traversal algorithms */ |
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311 |
struct state *next; /* chain for traversing all */ |
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312 |
struct state *prev; /* back chain */ |
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313 |
struct arcbatch oas; /* first arcbatch, avoid malloc in easy case */ |
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314 |
int noas; /* number of arcs used in first arcbatch */ |
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315 |
}; |
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316 |
|
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317 |
struct nfa { |
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318 |
struct state *pre; /* pre-initial state */ |
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struct state *init; /* initial state */ |
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struct state *final; /* final state */ |
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321 |
struct state *post; /* post-final state */ |
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322 |
int nstates; /* for numbering states */ |
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323 |
struct state *states; /* state-chain header */ |
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struct state *slast; /* tail of the chain */ |
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struct state *free; /* free list */ |
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struct colormap *cm; /* the color map */ |
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327 |
color bos[2]; /* colors, if any, assigned to BOS and BOL */ |
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color eos[2]; /* colors, if any, assigned to EOS and EOL */ |
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329 |
struct vars *v; /* simplifies compile error reporting */ |
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330 |
struct nfa *parent; /* parent NFA, if any */ |
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331 |
}; |
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332 |
|
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333 |
|
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|
334 |
|
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335 |
/* |
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336 |
* definitions for compacted NFA |
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*/ |
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338 |
struct carc { |
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color co; /* COLORLESS is list terminator */ |
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int to; /* state number */ |
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341 |
}; |
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342 |
|
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struct cnfa { |
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int nstates; /* number of states */ |
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int ncolors; /* number of colors */ |
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int flags; |
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# define HASLACONS 01 /* uses lookahead constraints */ |
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int pre; /* setup state number */ |
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int post; /* teardown state number */ |
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color bos[2]; /* colors, if any, assigned to BOS and BOL */ |
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351 |
color eos[2]; /* colors, if any, assigned to EOS and EOL */ |
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352 |
struct carc **states; /* vector of pointers to outarc lists */ |
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struct carc *arcs; /* the area for the lists */ |
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354 |
}; |
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355 |
#define ZAPCNFA(cnfa) ((cnfa).nstates = 0) |
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#define NULLCNFA(cnfa) ((cnfa).nstates == 0) |
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|
357 |
|
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|
358 |
|
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|
359 |
|
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360 |
/* |
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361 |
* subexpression tree |
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362 |
*/ |
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363 |
struct subre { |
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char op; /* '|', '.' (concat), 'b' (backref), '(', '=' */ |
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char flags; |
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# define LONGER 01 /* prefers longer match */ |
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# define SHORTER 02 /* prefers shorter match */ |
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# define MIXED 04 /* mixed preference below */ |
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# define CAP 010 /* capturing parens below */ |
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# define BACKR 020 /* back reference below */ |
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# define INUSE 0100 /* in use in final tree */ |
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# define LOCAL 03 /* bits which may not propagate up */ |
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# define LMIX(f) ((f)<<2) /* LONGER -> MIXED */ |
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# define SMIX(f) ((f)<<1) /* SHORTER -> MIXED */ |
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# define UP(f) (((f)&~LOCAL) | (LMIX(f) & SMIX(f) & MIXED)) |
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# define MESSY(f) ((f)&(MIXED|CAP|BACKR)) |
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# define PREF(f) ((f)&LOCAL) |
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# define PREF2(f1, f2) ((PREF(f1) != 0) ? PREF(f1) : PREF(f2)) |
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# define COMBINE(f1, f2) (UP((f1)|(f2)) | PREF2(f1, f2)) |
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short retry; /* index into retry memory */ |
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int subno; /* subexpression number (for 'b' and '(') */ |
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short min; /* min repetitions, for backref only */ |
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short max; /* max repetitions, for backref only */ |
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struct subre *left; /* left child, if any (also freelist chain) */ |
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struct subre *right; /* right child, if any */ |
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struct state *begin; /* outarcs from here... */ |
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struct state *end; /* ...ending in inarcs here */ |
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struct cnfa cnfa; /* compacted NFA, if any */ |
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struct subre *chain; /* for bookkeeping and error cleanup */ |
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390 |
}; |
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391 |
|
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|
392 |
|
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|
393 |
|
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394 |
/* |
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* table of function pointers for generic manipulation functions |
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* A regex_t's re_fns points to one of these. |
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397 |
*/ |
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struct fns { |
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VOID FUNCPTR(free, (regex_t *)); |
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400 |
}; |
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401 |
|
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402 |
|
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|
403 |
|
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404 |
/* |
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* the insides of a regex_t, hidden behind a void * |
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406 |
*/ |
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407 |
struct guts { |
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408 |
int magic; |
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# define GUTSMAGIC 0xfed9 |
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410 |
int cflags; /* copy of compile flags */ |
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long info; /* copy of re_info */ |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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412 |
size_t nsub; /* copy of re_nsub */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
413 |
struct subre *tree; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
414 |
struct cnfa search; /* for fast preliminary search */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
int ntree; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
struct colormap cmap; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
417 |
int FUNCPTR(compare, (CONST chr *, CONST chr *, size_t)); |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
418 |
struct subre *lacons; /* lookahead-constraint vector */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
419 |
int nlacons; /* size of lacons */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
420 |
}; |